Synthesis, cytotoxic and antitubercular activities of copper(II) complexes with heterocyclic bases and 3-hydroxypicolinic acid

• Autor(a) principal: Almeida, Janaina do Couto
• Data de Publicação: 2016
• Outros Autores: Marzano, Ivana M., Pivatto, Marcos, Lopes, Norberto P., Da Costa Ferreira, Ana M., Pavan, F. R. [UNESP], Silva, I. C. [UNESP], Pereira-Maia, Elene C., Von Poelhsitz, G., Guerra, Wendell
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ica.2016.03.005; http://hdl.handle.net/11449/161431
• topic: Copper complexes; N-donor heterocyclic ligands; Antimycobacterial activity; 3-Hydroxypicolinic acid; Cytotoxicity activity

Two new copper(II) complexes with the deprotonated ligand 3-hydroxypicolinic acid (3-HPA) and heterocyclic bases (1,10-phenanthroline - phen or 2,2'-bipyridine -bpy) were synthesized. [Cu(3-HPA)(phen)ClO4] I and [Cu(3-HPA)(bpy)ClO4] II were characterized by elemental analyses, conductivity measurements, FT-IR, UV-Vis, EPR and High-resolution Electrospray Ionization Mass Spectrometry (HRESIMS). The results indicate that the geometry around the copper ion is distorted square-pyramidal, and that the copper ion is coordinated to 3-HPA via oxygen and nitrogen atoms, and to heterocyclic bases via their two nitrogen atoms. A perchlorate ion weakly bonded occupies the apical position, completing the metal coordination sphere. In this work, the compound [Cu(3-HPA)(2)] III was also synthesized using a new method, different from that described in the literature. The cytotoxic activity of these compounds against tumor and normal cell lines was investigated. Complex I exhibited a strong antitumor activity, being the most active in the series of studied complexes. The compounds were also evaluated for activity against Mycobacterium tuberculosis, and the complex I displays good antimycobacterial activity, while compounds II and III were only moderately active. (C) 2016 Elsevier B.V. All rights reserved.